Constantine III (400–411)
Born 400 CE, died 411 CE.
Constantine III (Latin: Flavius Claudius Constantinus; died shortly before 18 September 411 AD) was a common Roman soldier who was declared emperor in Roman Britain in 407 and established himself in Gaul. He was recognised as co-emperor of the Roman Empire from 409 until 411. Constantine rose to power from within the field army of Roman Britain and was acclaimed emperor in early 407. He promptly moved to Gaul (modern France), taking all of the mobile troops from Britain, with their commander Gerontius, to confront bands of Germanic invaders who had crossed the Rhine the previous winter. With a mixture of fighting and diplomacy Constantine stabilised the situation and established control over Gaul and Hispania (modern Spain and Portugal), establishing his capital at Arles. The sitting emperor of the Western Roman Empire, Honorius, sent an army under Sarus the Goth to expel Constantine's forces. After initial victories, Sarus was repulsed. In Hispania, Honorius's relatives rose and expelled Constantine's administration. Constantine raised his oldest son to co-emperor as Constans II and sent him with an army to deal with this.
Text from the Wikipedia article Constantine_III_(Western_Roman_emperor), licensed CC BY-SA 4.0.